Question

Find all regular points of the surface {x∈r4|(x_1)^2 +(x_2)^2 +(x_3)^2 +(x_4)^2 =1, (x_1)^4 + (x_2)^4 + (x_3)^4 + (x_4)^4 =1}. where x_1, x_2, x_3, x_4 are all different variables.4

Answer 1

which class question is this??